Prefer io.BytesIO over six; available on all supported Pythons

On all supported Pythons, the io.BytesIO is always a stream implementation using an in-memory bytes buffer. Makes code slightly more forward compatible by reducing use of the six module.
pypa · Oct 19, 2018 · 2d545dd · 2d545dd
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diff --git a/news/a035c999-332b-4096-aa90-455f8d603129.trivial b/news/a035c999-332b-4096-aa90-455f8d603129.trivial
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
@@ -11,10 +11,10 @@
 import tempfile
 import time
 import warnings
+from io import BytesIO
 
 import pytest
 from mock import Mock, patch
-from pip._vendor.six import BytesIO
 
 from pip._internal.exceptions import (
     HashMismatch, HashMissing, InstallationError, UnsupportedPythonVersion,